#back_top{position:fixed;bottom:20px;right:20px;background:#ff767b;background:rgba(255,118,123,.7);width:50px;height:50px;display:block;text-decoration:none;-webkit-border-radius:35px;-moz-border-radius:35px;border-radius:35px;display:none;-webkit-transition:all .3s linear;-moz-transition:all .3s ease;-ms-transition:all .3s ease;-o-transition:all .3s ease;transition:all .3s ease}#back_top i{color:#fff;margin:0;position:relative;left:16px;top:13px;font-size:19px;-webkit-transition:all .3s ease;-moz-transition:all .3s ease;-ms-transition:all .3s ease;-o-transition:all .3s ease;transition:all .3s ease}